This section is from the book "Wild Flowers Of New York", by Homer D. House. Also available from Amazon: Wild Flowers Of New York.
The Stiff Gentian (Gentiana quinquefolia Linnaeus), (Figure XXV) has smaller flowers in dense clusters at the ends of the branches; the blue corolla tube is one-half to three-fourths of an inch long with five equal, triangular lobes which are not fringed. Rather common in dry or moist shady woods.

Figure XXV - Stiff Gentian; Agueweed (Gentiana quinquefolia Linnaeus)
 
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